CN111455708B - Preparation method of low-gram-weight writing paper - Google Patents
Preparation method of low-gram-weight writing paper Download PDFInfo
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- CN111455708B CN111455708B CN202010413413.8A CN202010413413A CN111455708B CN 111455708 B CN111455708 B CN 111455708B CN 202010413413 A CN202010413413 A CN 202010413413A CN 111455708 B CN111455708 B CN 111455708B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
Abstract
The invention belongs to the technical field of papermaking, and particularly relates to a preparation method of low-gram-weight writing paper. In the preparation method, two stages of parallel fine screening devices are additionally arranged at the fine screening stage of a newspaper DIP production line, and a slag separator is connected in series between a front flotation stage and a rear multi-disk stage at the second stage; the newsprint DIP line is improved to have the capability of producing cultural paper pulp; and the produced writing paper with low gram weight has better paper performance.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a preparation method of low-gram-weight writing paper.
Background
Under the large background that electronic media are rapidly developed and paper media are greatly impacted, the problem that newsprint products are over-supplied and over-demanded is obvious, and the problem that the capacity is not sufficiently utilized is obvious. How the paper industry is expected to enter a slow pace in the coming years is in a difficult time to develop in the current industry. The traditional news media printed on paper has been in a state of irreversibility, and the newsprint still has irreplaceable effect in a short time, but the main effect of the newsprint in information dissemination is weakened continuously.
The trend of the future development of the newsprint industry in the future mainly includes the following points: 1. advances in production technology and the rapid development of electronic media will lead to a dramatic drop in newsprint demand, and this trend will not be reversible. 2. The core competitiveness of the newsprint industry is to require new marketing dependence, improve product quality and perfect a service system. 3. Although the market is further reduced, the market cannot disappear in a short time, the competition of the industry is more intense, and the bankruptcy, the industry adjustment and the purchasing integration of related industries are accelerated.
In the face of the problems in the newsprint industry, various existing newsprint paper-making technologies are improved, but in the prior art, the existing paper-making technologies are mostly optimized and upgraded, and the types of produced paper-making are not changed. For example, chinese patent application CN 108221425 a discloses a method for preparing recycled newsprint from old newsprint. The modified filler is prepared by taking calcium carbonate as a raw material, chitosan, octadecanoic acid and sodium hydroxide as a wrapping agent and calcium chloride as a crosslinking agent, and the surface of the calcium carbonate can be well coated with the crosslinked substance of the cationic chitosan, so that the surface of the calcium carbonate is soft and can be fully combined with fibers, and the bonding force between the modified calcium carbonate and the fibers is enhanced, so that the retention rate of the filler calcium carbonate is improved, the production cost of the newsprint can be reduced, and the pollution load of the environment can be reduced. The method solves the problems that all the current recycled newsprint processes not only pollute the environment, but also have poor newsprint quality. And Chinese patent application CN1958950A discloses an environment-friendly newsprint reconstruction technology, which takes titanium dioxide photocatalyst with the particle size distribution range of 2-500 nanometers as an additive material on the basis of the existing paper making process, so that the newsprint is made into environment-friendly newsprint which can prevent worm damage and mildew, and the newsprint has the functions of collection and storage.
No matter the old newsprint is produced and prepared the regeneration newsprint or is carried out the promotion improvement to its performance, can not change the impact of electronic media to the newsprint trade, therefore, in order to twist reverse the newsprint market and shrink year by year, simultaneously along with the impact of a large amount of imported newsprint to domestic newsprint market in recent years, and these unfavorable situations of marketing difficulty have appeared in newsprint at present, can reform transform newsprint DIP production line, through reforming transform, let it possess the ability of production culture paper pulp material, make the newsprint machine change the culture paper. The product diversity of the papermaking industry can be increased, and the method has important significance for improving the market competitiveness of enterprises.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a preparation technology of low-gram-weight writing paper, which can enable the writing paper to have the capability of producing cultural paper pulp by modifying a DIP line of newsprint.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a preparation method of low-gram-weight writing paper comprises the following steps:
two stages of parallel fine screening equipment are additionally arranged at the fine screening stage of the DIP production line of the newsprint, and a slag separator is connected in series between a front flotation stage and a rear multi-disc stage of the second stage;
preferably, the method for preparing the low-gram-weight writing paper comprises the following steps:
(1) pulping and pre-treating the raw materials to prepare coarse paper pulp;
(2) the coarse paper pulp sequentially passes through: first-stage pre-flotation and fine screening to obtain fine pulp and residues;
(3) the fine pulp is sequentially processed by: front multi-disc, heat dispersion, two-stage front flotation, slag separator, back multi-disc, reduction bleaching, finally making low-gram weight writing paper in DIP pulp tower;
in the step (2), the fine screen is divided into three sections, namely a first-section fine screen, a second-section fine screen and a third-section fine screen, and is a grading treatment process, and fine pulp obtained after coarse paper pulp is subjected to fine screen treatment enters a subsequent treatment section.
The writing paper with low gram weight in the invention is writing paper with the quantitative range of 55-60g/m 2.
Preferably, a two-stage fine screen is arranged in parallel at the two-stage fine screen to obtain two-stage parallel two-stage fine screens; arranging a three-section fine screen at the three-section fine screen to obtain two-stage parallel three-section fine screens; after passing through a first-stage fine screen, the paper pulp is sequentially treated by a two-stage parallel two-stage fine screen and a two-stage parallel three-stage fine screen and then enters a front multi-disc.
Preferably, the screen gaps of the first-stage fine screen, the second-stage fine screen and the third-stage fine screen are 0.17mm-0.12 mm;
preferably, the first-stage pre-flotation and the second-stage pre-flotation are both carried out in a flotation jet device, and the number of holes of the flotation jet device is 16-28;
preferably, the slag remover treatment process is a 1-6-stage grading treatment; the slag separator is a high-efficiency slag separator with low concentration of Kaiden.
Preferably, the reagents used for the reductive bleaching are: the sodium borohydride-sodium bisulfite-sodium citrate composite material is a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1: 6-8: 1-2, preferably 1:8: 2.
Preferably, the amount of agent used for the reductive bleaching is 12-18 kg/ton of raw material.
Preferably, the pulping is carried out in a drum pulper;
preferably, the pulping process further comprises adding a pulping agent into the drum pulper;
preferably, the pulping agent comprises: caustic soda, sodium soap, deinking agent;
preferably, the pulping agent comprises 6-10 parts by weight of caustic soda, 12-16 parts by weight of sodium soap and 0.2-0.3 part by weight of deinking agent;
preferably, the using amount of the pulping agent is 18-27 kg/ton of raw materials;
preferably, the one-stage pre-flotation process further comprises adding a deinking agent;
preferably, the deinking agent is used in an amount of 0.13-0.18 kg/ton coarse pulp;
preferably, the good pulp is subjected to two-stage pre-flotation and then enters a slag separator, and a post-flotation process is also performed, wherein a deinking agent is added in the post-flotation process;
preferably, the amount of the deinking agent is 0.005-0.05 kg/ton good pulp;
preferably, the deinking agent consists of sodium fatty acid and fatty alcohol, wherein the mass ratio of the sodium fatty acid to the fatty alcohol is 3-10:1-5, preferably 8: 2;
preferably, a thermal dispersing agent is added in the thermal dispersing process;
preferably, the composition of the thermal dispersant is: hydrogen peroxide, caustic soda and a chelating agent;
preferably, the thermal dispersant comprises the following components in parts by weight: 10-50 parts of hydrogen peroxide, 6-12 parts of caustic soda and 0.6-1 part of chelating agent;
preferably, the chelating agent is ethylenediaminetetraacetic acid and derivatives thereof;
preferably, the dosage of the thermal dispersant is 16-64 kg/ton of good pulp;
preferably, the method for preparing the low-gram-weight writing paper comprises the following steps:
(1) pulping raw materials and pretreating: pulping the raw materials, removing slag, roughing, and removing heavy slag to obtain coarse paper pulp;
(2) the selection treatment process comprises the following steps: sequentially carrying out first-stage pre-flotation and fine screening on coarse paper pulp to obtain fine pulp and residues;
(3) and (3) selecting and post-treating: the fine pulp is sequentially processed by: front multi-disc, front middle-concentration vertical pipe, screw press, thermal dispersion, bleaching tower, two-stage front flotation, slag separator, back multi-disc, back middle-concentration vertical pipe, reduction bleaching, and finally making low-gram-weight writing paper in DIP pulp tower.
Compared with the prior art, the invention has the technical advantages that:
(1) the invention does not greatly reform the existing newsprint production line, does not need to stop the normal production of the newsprint during the reformation, only needs to complete part of the pipeline end collision work during the daily shutdown maintenance, and has the total project investment obviously lower than that of similar reformation in the same industry.
(2) After the DIP production line of the newsprint is modified, the whiteness of the paper is increased, the requirement of cultural paper is met, and the cleanliness is obviously improved.
(3) The sodium citrate used in the invention can effectively promote the reduction bleaching effect of sodium borohydride and sodium bisulfite, effectively adsorb impurities and pollutants in paper pulp, and increase the cleanliness of paper.
(4) The selection of the screen gaps improves the cleanliness and simultaneously ensures that the productivity is not reduced.
(5) The flotation jet device is improved, so that the removal rate of the flotation ink is improved.
Drawings
FIG. 1: the main flow chart of the invention.
The invention will now be further illustrated with reference to the accompanying drawings and examples:
Detailed Description
The present invention will be described below with reference to specific examples to make the technical aspects of the present invention easier to understand and grasp, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
The Keden low-concentration high-efficiency slag remover used in the invention is an NOSS slag remover sold by Keden (manufacturers) and can be purchased in the market.
Basic embodiment
The preparation method for producing the low-gram-weight writing paper disclosed by the invention has the main flow as shown in figure 1, and comprises the following steps of:
(1) pretreatment of raw materials: pulping the raw materials, removing slag, roughing, and removing heavy slag to obtain coarse paper pulp;
(2) the selection treatment process comprises the following steps: sequentially carrying out first-stage pre-flotation and fine screening on coarse paper pulp to obtain fine pulp and residues;
(3) and (3) selecting and post-treating: the fine pulp is sequentially processed by: front multi-disc, front middle-concentration vertical pipe, screw press, thermal dispersion, bleaching tower, two-stage front flotation, slag separator, back multi-disc, back middle-concentration vertical pipe, reduction bleaching, and finally making low-gram-weight writing paper in DIP pulp tower.
In the step (2), the fine screen is divided into three sections, namely a first-section fine screen, a second-section fine screen and a third-section fine screen, and is a grading treatment process, and fine pulp obtained after coarse paper pulp is subjected to fine screen treatment enters a subsequent treatment section;
arranging a two-section fine screen at the two-section fine screen to obtain two-section fine screens connected in parallel; arranging a three-section fine screen at the three-section fine screen to obtain two-stage parallel three-section fine screens; after passing through a first-stage fine screen, the paper pulp is sequentially treated by a two-stage parallel two-stage fine screen and a two-stage parallel three-stage fine screen and then enters a front multi-disc.
The pulping is carried out in a drum pulper; the first-stage pre-flotation and the second-stage pre-flotation are both carried out in a flotation jet device, and the treatment process of the slag remover is 1-6 stages of grading treatment; the slag separator is a high-efficiency slag separator with low concentration of Kaiden.
Examples 1 to 3 of the present invention and comparative examples 1 to 4 are tests conducted on the basis of the basic examples.
Example 1
In this example, the screen gaps of the first-stage fine screen, the second-stage fine screen and the third-stage fine screen are 0.17 mm; the number of holes of the flotation jet device is 16;
the reagents used for the reductive bleaching are: the sodium hydrogen sulfide-sodium citrate composite material is a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1:7: 1; the dosage of the reducing bleaching agent is 14 kg/ton raw material;
the pulping process also comprises the step of adding a pulping agent into the drum pulper, wherein the using amount of the pulping agent is 18 kg/ton of raw materials; the pulping agent comprises 6 parts by weight of caustic soda, 12 parts by weight of sodium soap (a product sold in the market of Xuzhou Widelide), and 0.2 part by weight of deinking agent;
in the first-stage pre-flotation process, a deinking agent is added; the consumption of the deinking agent is 0.13 kg/ton of coarse paper pulp;
performing post-flotation on the good pulp after the two-stage pre-flotation and before the good pulp enters a slag separator, wherein a deinking agent is added in the post-flotation process, and the using amount of the deinking agent is 0.005 kg/ton of the good pulp;
the deinking agent described above in this example was composed of sodium fatty acid and fatty alcohol (sodium fatty acid is C)17H35COONa, wherein the fatty alcohol is a straight-chain alcohol with the carbon number of C12), and the mass ratio of the sodium fatty acid to the fatty alcohol is 3: 5;
adding a thermal dispersant in the thermal dispersion process, wherein the dosage of the thermal dispersant is 16 kg/ton of good pulp; the thermal dispersant comprises the following components: 10 parts of hydrogen peroxide, 6 parts of caustic soda and 0.6 part of chelating agent; wherein the chelating agent is ethylenediamine tetraacetic acid.
Example 2
In this example, the screen gaps of the first-stage fine screen, the second-stage fine screen and the third-stage fine screen are 0.12 mm; the number of holes of the flotation jet device is 28;
the reagents used for the reductive bleaching are: the sodium borohydride-sodium bisulfite-sodium citrate composite material is a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1: 6: 2; the dosage of the reduction bleaching agent is 12 kg/ton raw material;
the pulping process also comprises the step of adding a pulping agent into the drum pulper, wherein the using amount of the pulping agent is 27 kg/ton of raw materials; the pulping agent comprises 10 parts by weight of caustic soda, 16 parts by weight of sodium soap and 0.3 part by weight of deinking agent;
in the first-stage pre-flotation process, a deinking agent is added; the consumption of the deinking agent is 0.18 kg/ton of coarse paper pulp;
performing post-flotation on the good pulp after the two-stage pre-flotation and before the good pulp enters a slag separator, wherein a deinking agent is added in the post-flotation process, and the using amount of the deinking agent is 0.05 kg/ton of the good pulp;
the deinking agent described above in this example was composed of sodium fatty acid and fatty alcohol (sodium fatty acid is C)17H35COONa, wherein the fatty alcohol is a straight-chain alcohol with the carbon number of C18), and the mass ratio of the fatty acid sodium to the fatty alcohol is 10: 1;
adding a thermal dispersant in the thermal dispersion process, wherein the dosage of the thermal dispersant is 64 kg/ton of good pulp; the thermal dispersant comprises the following components: 50 parts of hydrogen peroxide, 12 parts of caustic soda and 1 part of chelating agent; wherein the chelating agent is disodium ethylene diamine tetraacetate.
Example 3
In the embodiment, the screen gap of the first-stage fine screen is 0.17mm, the screen gap of the second-stage fine screen is 0.15mm, and the screen gap of the third-stage fine screen is 0.12 mm; the number of holes of the flotation jet device is 20;
the reagents used for the reductive bleaching are: the sodium borohydride-sodium bisulfite-sodium citrate composite material is a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1:8: 2; the dosage of the reducing bleaching agent is 18 kg/ton raw material;
the pulping process also comprises the step of adding a pulping agent into the drum pulper, wherein the using amount of the pulping agent is 20 kg/ton of raw materials; the pulping agent comprises 7 parts by weight of caustic soda, 10 parts by weight of sodium soap and 0.2 part by weight of deinking agent;
in the first-stage pre-flotation process, a deinking agent is added; the consumption of the deinking agent is 0.15 kg/ton of coarse paper pulp;
performing post-flotation on the good pulp after the two-stage pre-flotation and before the good pulp enters a slag separator, wherein a deinking agent is added in the post-flotation process, and the using amount of the deinking agent is 0.01 kg/ton of the good pulp;
the deinking agent described above in this example was composed of sodium fatty acid and fatty alcohol (sodium fatty acid is C)17H35COONa, wherein the fatty alcohol is a straight-chain alcohol with the carbon number of C16), and the mass ratio of the fatty acid sodium to the fatty alcohol is 8: 2;
adding a thermal dispersant in the thermal dispersion process, wherein the dosage of the thermal dispersant is 20 kg/ton of good pulp; the thermal dispersant comprises the following components: 20 parts of hydrogen peroxide, 9 parts of caustic soda and 0.8 part of chelating agent; wherein the chelating agent is ethylenediamine tetraacetic acid.
Comparative example 1
Compared with example 3, the difference is only the fine screen slot width.
In the embodiment, the screen gap of the first-stage fine screen is 0.20mm, the screen gap of the second-stage fine screen is 0.15mm, and the screen gap of the third-stage fine screen is 0.12 mm; the number of holes of the flotation jet device is 20;
the reagents used for the reductive bleaching are: the sodium borohydride-sodium bisulfite-sodium citrate composite material is a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1:8: 2; the dosage of the reducing bleaching agent is 18 kg/ton raw material;
the pulping process also comprises the step of adding a pulping agent into the drum pulper, wherein the using amount of the pulping agent is 20 kg/ton of raw materials; the pulping agent comprises 7 parts by weight of caustic soda, 10 parts by weight of sodium soap and 0.2 part by weight of deinking agent;
in the first-stage pre-flotation process, a deinking agent is added; the consumption of the deinking agent is 0.15 kg/ton of coarse paper pulp;
performing post-flotation on the good pulp after the two-stage pre-flotation and before the good pulp enters a slag separator, wherein a deinking agent is added in the post-flotation process, and the using amount of the deinking agent is 0.01 kg/ton of the good pulp;
the deinking agent described above in this example consists of sodium fatty acid and fatty alcohol (same as example 3), wherein the mass ratio of sodium fatty acid to fatty alcohol is 8: 2;
adding a thermal dispersant in the thermal dispersion process, wherein the dosage of the thermal dispersant is 20 kg/ton of good pulp; the thermal dispersant comprises the following components: 20 parts of hydrogen peroxide, 9 parts of caustic soda and 0.8 part of chelating agent; wherein the chelating agent is ethylenediamine tetraacetic acid.
Comparative example 2
Compared with example 3, the difference is only the fine screen slot width.
In this example, the screen gaps of the first-stage fine screen, the second-stage fine screen and the third-stage fine screen are 0.25 mm; the number of holes of the flotation jet device is 20;
the reagents used for the reductive bleaching are: the sodium borohydride-sodium bisulfite-sodium citrate composite material is a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1:8: 2; the dosage of the reducing bleaching agent is 18 kg/ton raw material;
the pulping process also comprises the step of adding a pulping agent into the drum pulper, wherein the using amount of the pulping agent is 20 kg/ton of raw materials; the pulping agent comprises 7 parts by weight of caustic soda, 10 parts by weight of sodium soap and 0.2 part by weight of deinking agent;
in the first-stage pre-flotation process, a deinking agent is added; the consumption of the deinking agent is 0.15 kg/ton of coarse paper pulp;
performing post-flotation on the good pulp after the two-stage pre-flotation and before the good pulp enters a slag separator, wherein a deinking agent is added in the post-flotation process, and the using amount of the deinking agent is 0.01 kg/ton of the good pulp;
the deinking agent described above in this example consists of sodium fatty acid and fatty alcohol (same as example 3), wherein the mass ratio of sodium fatty acid to fatty alcohol is 8: 2;
adding a thermal dispersant in the thermal dispersion process, wherein the dosage of the thermal dispersant is 20 kg/ton of good pulp; the thermal dispersant comprises the following components: 20 parts of hydrogen peroxide, 9 parts of caustic soda and 0.8 part of chelating agent; wherein the chelating agent is ethylenediamine tetraacetic acid.
Comparative example 3
The difference compared to example 3 is only the type of bleaching agent.
In the embodiment, the screen gap of the first-stage fine screen is 0.17mm, the screen gap of the second-stage fine screen is 0.15mm, and the screen gap of the third-stage fine screen is 0.12 mm; the number of holes of the flotation jet device is 20;
the reagents used for the reductive bleaching are: the preparation method comprises the following steps of (1) mixing sodium borohydride and sodium bisulfite, wherein the mass ratio of the sodium borohydride to the sodium bisulfite is 1: 8; the dosage of the reducing bleaching agent is 18 kg/ton raw material;
the pulping process also comprises the step of adding a pulping agent into the drum pulper, wherein the using amount of the pulping agent is 20 kg/ton of raw materials; the pulping agent comprises 7 parts by weight of caustic soda, 10 parts by weight of sodium soap and 0.2 part by weight of deinking agent;
in the first-stage pre-flotation process, a deinking agent is added; the consumption of the deinking agent is 0.15 kg/ton of coarse paper pulp;
performing post-flotation on the good pulp after the two-stage pre-flotation and before the good pulp enters a slag separator, wherein a deinking agent is added in the post-flotation process, and the using amount of the deinking agent is 0.01 kg/ton of the good pulp;
the deinking agent described above in this example consists of sodium fatty acid and fatty alcohol (same as example 3), wherein the mass ratio of sodium fatty acid to fatty alcohol is 8: 2;
adding a thermal dispersant in the thermal dispersion process, wherein the dosage of the thermal dispersant is 20 kg/ton of good pulp; the thermal dispersant comprises the following components: 20 parts of hydrogen peroxide, 9 parts of caustic soda and 0.8 part of chelating agent; wherein the chelating agent is ethylenediamine tetraacetic acid.
Comparative example 4
The difference compared to example 3 is only in the kind of the deinking agent.
In the embodiment, the screen gap of the first-stage fine screen is 0.17mm, the screen gap of the second-stage fine screen is 0.15mm, and the screen gap of the third-stage fine screen is 0.12 mm; the number of holes of the flotation jet device is 20;
the reagents used for the reductive bleaching are: the sodium borohydride-sodium bisulfite-sodium citrate composite material is a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1:8: 2; the dosage of the reducing bleaching agent is 18 kg/ton raw material;
the pulping process also comprises the step of adding a pulping agent into the drum pulper, wherein the using amount of the pulping agent is 20 kg/ton of raw materials; the pulping agent comprises 7 parts by weight of caustic soda, 10 parts by weight of sodium soap and 0.2 part by weight of deinking agent;
in the first-stage pre-flotation process, a deinking agent is added; the consumption of the deinking agent is 0.15 kg/ton of coarse paper pulp;
performing post-flotation on the good pulp after the two-stage pre-flotation and before the good pulp enters a slag separator, wherein a deinking agent is added in the post-flotation process, and the using amount of the deinking agent is 0.01 kg/ton of the good pulp;
the deinking agent described above in this example is an alpha-alkyl sulfonate;
adding a thermal dispersant in the thermal dispersion process, wherein the dosage of the thermal dispersant is 20 kg/ton of good pulp; the thermal dispersant comprises the following components: 20 parts of hydrogen peroxide, 9 parts of caustic soda and 0.8 part of chelating agent; wherein the chelating agent is ethylenediamine tetraacetic acid.
Comparative example 5
Compared with example 3, the difference is only in the number of holes of the flotation jet.
In the embodiment, the screen gap of the first-stage fine screen is 0.17mm, the screen gap of the second-stage fine screen is 0.15mm, and the screen gap of the third-stage fine screen is 0.12 mm; the number of the holes of the flotation jet device is 10;
the reagents used for the reductive bleaching are: the sodium hydrogen sulfide sodium citrate injection comprises a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1: 8; the dosage of the reducing bleaching agent is 18 kg/ton raw material;
the pulping process also comprises the step of adding a pulping agent into the drum pulper, wherein the using amount of the pulping agent is 20 kg/ton of raw materials; the pulping agent comprises 7 parts by weight of caustic soda, 10 parts by weight of sodium soap and 0.2 part by weight of deinking agent;
in the first-stage pre-flotation process, a deinking agent is added; the consumption of the deinking agent is 0.15 kg/ton of coarse paper pulp;
performing post-flotation on the good pulp after the two-stage pre-flotation and before the good pulp enters a slag separator, wherein a deinking agent is added in the post-flotation process, and the using amount of the deinking agent is 0.01 kg/ton of the good pulp;
the deinking agent in the embodiment is composed of sodium fatty acid and fatty alcohol, wherein the mass ratio of the sodium fatty acid to the fatty alcohol is 8: 2;
adding a thermal dispersant in the thermal dispersion process, wherein the dosage of the thermal dispersant is 20 kg/ton of good pulp; the thermal dispersant comprises the following components: 20 parts of hydrogen peroxide, 9 parts of caustic soda and 0.8 part of chelating agent; wherein the chelating agent is ethylenediamine tetraacetic acid.
Examples of effects
The dust degree of the writing paper before and after reconstruction and in the prior art is tested by the method specified in GBT 1541-2007 determination of dust degree of paper and paperboard, the tearing degree of the paper is measured by the method of GB T455.1-1989 determination of tearing degree of paper, and the whiteness of the writing paper is tested by a paper whiteness meter (ELREPHO Code 070), and the result is shown in Table 1.
TABLE 1 paper Performance data
| Test group | Dust degree/(piece/m)2) | Whiteness (ISO)% | Transverse tear strength/(mN. m)2/g) | Fracture length/(m) |
| Writing paper of prior art | 50 | 76 | 340 | 6.3 |
| Newsprint paper | 60 | 58 | 295 | 5.6 |
| Example 1 | 25 | 81 | 350 | 6.7 |
| Example 2 | 22 | 82 | 355 | 6.9 |
| Example 3 | 20 | 81 | 360 | 7.0 |
| Comparative example 1 | 30 | 81 | 349 | 6.3 |
| Comparative example 2 | 35 | 80 | 342 | 6.4 |
| Comparative example 3 | 30 | 76 | 345 | 6.5 |
| Comparative example 4 | 40 | 78 | 331 | 6.4 |
| Comparative example 5 | 35 | 78 | 340 | 6.3 |
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present invention.
Claims (7)
1. A preparation method of low-gram-weight writing paper is characterized by comprising the following steps:
(1) pulping and pre-treating the raw materials to prepare coarse paper pulp;
(2) the coarse paper pulp sequentially passes through: first-stage pre-flotation and fine screening to obtain fine pulp and residues;
(3) the fine pulp is sequentially processed by: front multi-disc, heat dispersion, two-stage front flotation, slag separator, back multi-disc, reduction bleaching, finally making low-gram weight writing paper in DIP pulp tower;
in the step (2), the fine screen is divided into three sections, namely a first-section fine screen, a second-section fine screen and a third-section fine screen, and is a grading treatment process, and fine pulp obtained after coarse paper pulp is subjected to fine screen treatment enters a subsequent treatment section;
the screen gaps of the first-stage fine screen, the second-stage fine screen and the third-stage fine screen are 0.12mm-0.17 mm;
the first-stage pre-flotation and the second-stage pre-flotation are both carried out in a flotation jet device, and the number of holes of the flotation jet device is 16-28;
the reagents used for the reductive bleaching are: the sodium borohydride-sodium bisulfite-sodium citrate composite material is a mixture of sodium borohydride, sodium bisulfite and sodium citrate, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1: 6-8: 1-2;
the pulping is carried out in a drum pulper; the pulping process also comprises the step of adding a pulping agent into the drum pulper; the pulping agent comprises: caustic soda, sodium soap and deinking agent;
the first-stage pre-flotation process also comprises adding a deinking agent; the good pulp is subjected to two-stage pre-flotation and then enters a slag separator, and a post-flotation process is also carried out, wherein a deinking agent is added in the post-flotation process;
the deinking agent in the pulping, the first-stage front flotation and the second-stage flotation consists of sodium aliphatate and fatty alcohol, wherein the mass ratio of the sodium aliphatate to the fatty alcohol is 3-10: 1-5.
2. The method for preparing the writing paper with low gram weight as claimed in claim 1, wherein a two-stage fine screen is arranged in parallel at the two-stage fine screen to obtain two-stage parallel two-stage fine screens; arranging a three-section fine screen at the three-section fine screen to obtain two-stage parallel three-section fine screens; after passing through a first-stage fine screen, the paper pulp is sequentially treated by a two-stage parallel two-stage fine screen and a two-stage parallel three-stage fine screen and then enters a front multi-disc.
3. The method of making a low grammage writing paper of claim 1, wherein the cleaner process is a 1 to 6 stage staging process; the slag separator is a Kaiden NOSS slag separator.
4. The method for preparing a writing paper with low gram weight as claimed in claim 1, wherein the mass ratio of the sodium borohydride to the sodium bisulfite to the sodium citrate is 1:8: 2.
5. A method of making a low grammage writing paper as in claim 1, wherein a thermal dispersant is added during the thermal dispersion; the thermal dispersant comprises the following components: hydrogen peroxide, caustic soda and a chelating agent.
6. The method of making a low grammage writing paper of claim 5, wherein the chelating agent is ethylenediaminetetraacetic acid and derivatives thereof.
7. A method of making a low grammage writing paper according to any of claims 1 to 6, comprising the steps of:
(1) pulping raw materials and pretreating: pulping the raw materials, removing slag, roughing, and removing heavy slag to obtain coarse paper pulp;
(2) the selection treatment process comprises the following steps: sequentially carrying out first-stage pre-flotation, first-stage fine screening, second-stage fine screening and third-stage fine screening on coarse paper pulp to obtain fine pulp and residues;
(3) and (3) selecting and post-treating: the fine pulp is sequentially processed by: front multi-disc, front middle-concentration vertical pipe, screw press, thermal dispersion, bleaching tower, two-stage front flotation, slag separator, back multi-disc, back middle-concentration vertical pipe, reduction bleaching, and finally making low-gram-weight writing paper in DIP pulp tower.
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| PCT/CN2020/103226 WO2021227249A1 (en) | 2020-05-15 | 2020-07-21 | Low-grammage writing paper and preparation method therefor |
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Denomination of invention: A preparation method for low weight writing paper Effective date of registration: 20230726 Granted publication date: 20210406 Pledgee: China Co. truction Bank Corp Ma'anshan branch Pledgor: SHANYING INTERNATIONAL HOLDING Co.,Ltd. Registration number: Y2023980049936 |